Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.gallery3d.ui; |
| 18 | |
Owen Lin | 2b3ee0e | 2012-03-14 17:27:24 +0800 | [diff] [blame] | 19 | import android.content.Context; |
Yuli Huang | 04ac045 | 2012-03-20 16:37:05 +0800 | [diff] [blame] | 20 | import android.graphics.Rect; |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 21 | import android.util.Log; |
| 22 | import android.widget.Scroller; |
Owen Lin | 2b3ee0e | 2012-03-14 17:27:24 +0800 | [diff] [blame] | 23 | |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 24 | import com.android.gallery3d.common.Utils; |
Chih-Chung Chang | 8f568da | 2012-01-05 12:00:53 +0800 | [diff] [blame] | 25 | import com.android.gallery3d.util.GalleryUtils; |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 26 | import com.android.gallery3d.util.RangeArray; |
| 27 | import com.android.gallery3d.util.RangeIntArray; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 28 | |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 29 | class PositionController { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 30 | private static final String TAG = "PositionController"; |
| 31 | |
Yuli Huang | 2ce3c3b | 2012-02-23 22:26:12 +0800 | [diff] [blame] | 32 | public static final int IMAGE_AT_LEFT_EDGE = 1; |
| 33 | public static final int IMAGE_AT_RIGHT_EDGE = 2; |
| 34 | public static final int IMAGE_AT_TOP_EDGE = 4; |
| 35 | public static final int IMAGE_AT_BOTTOM_EDGE = 8; |
| 36 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 37 | // Special values for animation time. |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 38 | private static final long NO_ANIMATION = -1; |
| 39 | private static final long LAST_ANIMATION = -2; |
| 40 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 41 | private static final int ANIM_KIND_SCROLL = 0; |
| 42 | private static final int ANIM_KIND_SCALE = 1; |
| 43 | private static final int ANIM_KIND_SNAPBACK = 2; |
| 44 | private static final int ANIM_KIND_SLIDE = 3; |
| 45 | private static final int ANIM_KIND_ZOOM = 4; |
| 46 | private static final int ANIM_KIND_OPENING = 5; |
| 47 | private static final int ANIM_KIND_FLING = 6; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 48 | |
Chih-Chung Chang | 676170e | 2011-09-30 18:33:17 +0800 | [diff] [blame] | 49 | // Animation time in milliseconds. The order must match ANIM_KIND_* above. |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 50 | private static final int ANIM_TIME[] = { |
Chih-Chung Chang | 676170e | 2011-09-30 18:33:17 +0800 | [diff] [blame] | 51 | 0, // ANIM_KIND_SCROLL |
| 52 | 50, // ANIM_KIND_SCALE |
| 53 | 600, // ANIM_KIND_SNAPBACK |
| 54 | 400, // ANIM_KIND_SLIDE |
| 55 | 300, // ANIM_KIND_ZOOM |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 56 | 600, // ANIM_KIND_OPENING |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 57 | 0, // ANIM_KIND_FLING (the duration is calculated dynamically) |
Chih-Chung Chang | 676170e | 2011-09-30 18:33:17 +0800 | [diff] [blame] | 58 | }; |
| 59 | |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 60 | // We try to scale up the image to fill the screen. But in order not to |
| 61 | // scale too much for small icons, we limit the max up-scaling factor here. |
| 62 | private static final float SCALE_LIMIT = 4; |
| 63 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 64 | // For user's gestures, we give a temporary extra scaling range which goes |
| 65 | // above or below the usual scaling limits. |
| 66 | private static final float SCALE_MIN_EXTRA = 0.7f; |
Chih-Chung Chang | 534b12f | 2012-03-21 19:01:30 +0800 | [diff] [blame] | 67 | private static final float SCALE_MAX_EXTRA = 1.4f; |
| 68 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 69 | // Setting this true makes the extra scaling range permanent (until this is |
| 70 | // set to false again). |
Chih-Chung Chang | 534b12f | 2012-03-21 19:01:30 +0800 | [diff] [blame] | 71 | private boolean mExtraScalingRange = false; |
Chih-Chung Chang | 676170e | 2011-09-30 18:33:17 +0800 | [diff] [blame] | 72 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 73 | // Film Mode v.s. Page Mode: in film mode we show smaller pictures. |
| 74 | private boolean mFilmMode = false; |
| 75 | private static final float FILM_MODE_SCALE_FACTOR = 0.7f; |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 76 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 77 | // The scaling factor in current mode. |
| 78 | private float mScaleFactor = mFilmMode ? FILM_MODE_SCALE_FACTOR : 1.0f; |
| 79 | |
| 80 | // In addition to the focused box (index == 0). We also keep information |
| 81 | // about this many boxes on each side. |
| 82 | private static final int BOX_MAX = PhotoView.SCREEN_NAIL_MAX; |
| 83 | |
| 84 | public static final int IMAGE_GAP = 96; |
| 85 | private static final int HORIZONTAL_SLACK = GalleryUtils.dpToPixel(12); |
| 86 | |
| 87 | private Listener mListener; |
| 88 | private volatile Rect mOpenAnimationRect; |
| 89 | private int mViewW = 640; |
| 90 | private int mViewH = 480;; |
| 91 | |
| 92 | // A scaling guesture is in progress. |
| 93 | private boolean mInScale; |
| 94 | // The focus point of the scaling gesture, relative to the center of the |
| 95 | // picture in bitmap pixels. |
| 96 | private float mFocusX, mFocusY; |
| 97 | |
| 98 | // This is used by the fling animation (page mode). |
| 99 | private FlingScroller mPageScroller; |
| 100 | |
| 101 | // This is used by the fling animation (film mode). |
| 102 | private Scroller mFilmScroller; |
| 103 | |
| 104 | // The bound of the stable region that the focused box can stay, see the |
| 105 | // comments above calculateStableBound() for details. |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 106 | private int mBoundLeft, mBoundRight, mBoundTop, mBoundBottom; |
| 107 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 108 | // |
| 109 | // ___________________________________________________________ |
| 110 | // | _____ _____ _____ _____ _____ | |
| 111 | // | | | | | | | | | | | | |
| 112 | // | | Box | | Box | | Box*| | Box | | Box | | |
| 113 | // | |_____|.....|_____|.....|_____|.....|_____|.....|_____| | |
| 114 | // | Gap Gap Gap Gap | |
| 115 | // |___________________________________________________________| |
| 116 | // |
| 117 | // <-- Platform --> |
| 118 | // |
| 119 | // The focused box (Box*) centers at mPlatform.mCurrentX |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 120 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 121 | private Platform mPlatform = new Platform(); |
| 122 | private RangeArray<Box> mBoxes = new RangeArray<Box>(-BOX_MAX, BOX_MAX); |
| 123 | // The gap at the right of a Box i is at index i. The gap at the left of a |
| 124 | // Box i is at index i - 1. |
| 125 | private RangeArray<Gap> mGaps = new RangeArray<Gap>(-BOX_MAX, BOX_MAX - 1); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 126 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 127 | // These are only used during moveBox(). |
| 128 | private RangeArray<Box> mTempBoxes = new RangeArray<Box>(-BOX_MAX, BOX_MAX); |
| 129 | private RangeArray<Gap> mTempGaps = new RangeArray<Gap>(-BOX_MAX, BOX_MAX - 1); |
| 130 | |
| 131 | // The output of the PositionController. Available throught getPosition(). |
| 132 | private RangeArray<Rect> mRects = new RangeArray<Rect>(-BOX_MAX, BOX_MAX); |
| 133 | |
| 134 | public interface Listener { |
| 135 | void invalidate(); |
| 136 | boolean isDown(); |
| 137 | |
| 138 | // EdgeView |
| 139 | void onPull(int offset, int direction); |
| 140 | void onRelease(); |
| 141 | void onAbsorb(int velocity, int direction); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 142 | } |
| 143 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 144 | public PositionController(Context context, Listener listener) { |
| 145 | mListener = listener; |
| 146 | mPageScroller = new FlingScroller(); |
| 147 | mFilmScroller = new Scroller(context); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 148 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 149 | // Initialize the areas. |
| 150 | initPlatform(); |
| 151 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 152 | mBoxes.put(i, new Box()); |
| 153 | initBox(i); |
| 154 | mRects.put(i, new Rect()); |
| 155 | } |
| 156 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 157 | mGaps.put(i, new Gap()); |
| 158 | initGap(i); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | public void setOpenAnimationRect(Rect r) { |
| 163 | mOpenAnimationRect = r; |
| 164 | } |
| 165 | |
| 166 | public void setViewSize(int viewW, int viewH) { |
| 167 | if (viewW == mViewW && viewH == mViewH) return; |
| 168 | |
| 169 | mViewW = viewW; |
| 170 | mViewH = viewH; |
| 171 | initPlatform(); |
| 172 | |
| 173 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 174 | setBoxSize(i, viewW, viewH, true); |
| 175 | } |
| 176 | |
| 177 | updateScaleAndGapLimit(); |
| 178 | snapAndRedraw(); |
| 179 | } |
| 180 | |
| 181 | public void setImageSize(int index, int width, int height) { |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 182 | if (width == 0 || height == 0) { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 183 | initBox(index); |
| 184 | } else { |
| 185 | setBoxSize(index, width, height, false); |
| 186 | } |
| 187 | |
| 188 | updateScaleAndGapLimit(); |
| 189 | startOpeningAnimationIfNeeded(); |
| 190 | snapAndRedraw(); |
| 191 | } |
| 192 | |
| 193 | private void setBoxSize(int i, int width, int height, boolean isViewSize) { |
| 194 | Box b = mBoxes.get(i); |
| 195 | |
| 196 | // If we already have image size, we don't want to use the view size. |
| 197 | if (isViewSize && !b.mUseViewSize) return; |
| 198 | b.mUseViewSize = isViewSize; |
| 199 | |
| 200 | if (width == b.mImageW && height == b.mImageH) { |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 201 | return; |
| 202 | } |
| 203 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 204 | // The ratio of the old size and the new size. |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 205 | float ratio = Math.min( |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 206 | (float) b.mImageW / width, (float) b.mImageH / height); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 207 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 208 | b.mCurrentScale *= ratio; |
| 209 | b.mFromScale *= ratio; |
| 210 | b.mToScale *= ratio; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 211 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 212 | b.mImageW = width; |
| 213 | b.mImageH = height; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 214 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 215 | if (i == 0) { |
| 216 | mFocusX /= ratio; |
| 217 | mFocusY /= ratio; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 218 | } |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 219 | } |
| 220 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 221 | private void startOpeningAnimationIfNeeded() { |
| 222 | if (mOpenAnimationRect == null) return; |
| 223 | Box b = mBoxes.get(0); |
| 224 | if (b.mUseViewSize) return; |
Chih-Chung Chang | 676170e | 2011-09-30 18:33:17 +0800 | [diff] [blame] | 225 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 226 | // Start animation from the saved rectangle if we have one. |
| 227 | Rect r = mOpenAnimationRect; |
| 228 | mOpenAnimationRect = null; |
| 229 | mPlatform.mCurrentX = r.centerX(); |
| 230 | b.mCurrentY = r.centerY(); |
| 231 | b.mCurrentScale = Math.max(r.width() / (float) b.mImageW, |
| 232 | r.height() / (float) b.mImageH); |
| 233 | startAnimation(mViewW / 2, mViewH / 2, b.mScaleMin, ANIM_KIND_OPENING); |
| 234 | } |
| 235 | |
| 236 | public void setFilmMode(boolean enabled) { |
| 237 | if (enabled == mFilmMode) return; |
| 238 | mFilmMode = enabled; |
| 239 | mScaleFactor = enabled ? FILM_MODE_SCALE_FACTOR : 1.0f; |
| 240 | |
| 241 | updateScaleAndGapLimit(); |
| 242 | stopAnimation(); |
| 243 | snapAndRedraw(); |
| 244 | } |
| 245 | |
| 246 | public void setExtraScalingRange(boolean enabled) { |
| 247 | if (mExtraScalingRange == enabled) return; |
| 248 | mExtraScalingRange = enabled; |
| 249 | if (!enabled) { |
| 250 | snapAndRedraw(); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | // This should be called whenever the scale range of boxes or the default |
| 255 | // gap size may change. Currently this can happen due to change of view |
| 256 | // size, image size, and mode. |
| 257 | private void updateScaleAndGapLimit() { |
| 258 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 259 | Box b = mBoxes.get(i); |
| 260 | b.mScaleMin = getMinimalScale(b.mImageW, b.mImageH); |
| 261 | b.mScaleMax = getMaximalScale(b.mImageW, b.mImageH); |
| 262 | } |
| 263 | |
| 264 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 265 | Gap g = mGaps.get(i); |
| 266 | g.mDefaultSize = getDefaultGapSize(i); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | // Returns the default gap size according the the size of the boxes around |
| 271 | // the gap and the current mode. |
| 272 | private int getDefaultGapSize(int i) { |
| 273 | if (mFilmMode) return IMAGE_GAP; |
| 274 | Box a = mBoxes.get(i); |
| 275 | Box b = mBoxes.get(i + 1); |
| 276 | return IMAGE_GAP + Math.max(gapToSide(a), gapToSide(b)); |
| 277 | } |
| 278 | |
| 279 | // Here is how we layout the boxes in the page mode. |
| 280 | // |
| 281 | // previous current next |
| 282 | // ___________ ________________ __________ |
| 283 | // | _______ | | __________ | | ______ | |
| 284 | // | | | | | | right->| | | | | | |
| 285 | // | | |<-------->|<--left | | | | | | |
| 286 | // | |_______| | | | |__________| | | |______| | |
| 287 | // |___________| | |________________| |__________| |
| 288 | // | <--> gapToSide() |
| 289 | // | |
| 290 | // IMAGE_GAP + MAX(gapToSide(previous), gapToSide(current)) |
| 291 | private int gapToSide(Box b) { |
| 292 | return (int) ((mViewW - getMinimalScale(b) * b.mImageW) / 2 + 0.5f); |
| 293 | } |
| 294 | |
| 295 | // Stop all animations at where they are now. |
| 296 | public void stopAnimation() { |
| 297 | mPlatform.mAnimationStartTime = NO_ANIMATION; |
| 298 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 299 | mBoxes.get(i).mAnimationStartTime = NO_ANIMATION; |
| 300 | } |
| 301 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 302 | mGaps.get(i).mAnimationStartTime = NO_ANIMATION; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | public void skipAnimation() { |
| 307 | if (mPlatform.mAnimationStartTime != NO_ANIMATION) { |
| 308 | mPlatform.mCurrentX = mPlatform.mToX; |
| 309 | mPlatform.mAnimationStartTime = NO_ANIMATION; |
| 310 | } |
| 311 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 312 | Box b = mBoxes.get(i); |
| 313 | if (b.mAnimationStartTime == NO_ANIMATION) continue; |
| 314 | b.mCurrentY = b.mToY; |
| 315 | b.mCurrentScale = b.mToScale; |
| 316 | b.mAnimationStartTime = NO_ANIMATION; |
| 317 | } |
| 318 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 319 | Gap g = mGaps.get(i); |
| 320 | if (g.mAnimationStartTime == NO_ANIMATION) continue; |
| 321 | g.mCurrentGap = g.mToGap; |
| 322 | g.mAnimationStartTime = NO_ANIMATION; |
| 323 | } |
| 324 | redraw(); |
| 325 | } |
| 326 | |
| 327 | public void up() { |
| 328 | snapAndRedraw(); |
| 329 | } |
| 330 | |
| 331 | //////////////////////////////////////////////////////////////////////////// |
| 332 | // Start an animations for the focused box |
| 333 | //////////////////////////////////////////////////////////////////////////// |
| 334 | |
| 335 | public void zoomIn(float tapX, float tapY, float targetScale) { |
| 336 | Box b = mBoxes.get(0); |
| 337 | |
| 338 | // Convert the tap position to distance to center in bitmap coordinates |
| 339 | float tempX = (tapX - mPlatform.mCurrentX) / b.mCurrentScale; |
| 340 | float tempY = (tapY - b.mCurrentY) / b.mCurrentScale; |
| 341 | |
| 342 | int x = (int) (mViewW / 2 - tempX * targetScale + 0.5f); |
| 343 | int y = (int) (mViewH / 2 - tempY * targetScale + 0.5f); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 344 | |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 345 | calculateStableBound(targetScale); |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 346 | int targetX = Utils.clamp(x, mBoundLeft, mBoundRight); |
| 347 | int targetY = Utils.clamp(y, mBoundTop, mBoundBottom); |
| 348 | targetScale = Utils.clamp(targetScale, b.mScaleMin, b.mScaleMax); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 349 | |
| 350 | startAnimation(targetX, targetY, targetScale, ANIM_KIND_ZOOM); |
| 351 | } |
| 352 | |
| 353 | public void resetToFullView() { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 354 | Box b = mBoxes.get(0); |
| 355 | startAnimation(mViewW / 2, mViewH / 2, b.mScaleMin, ANIM_KIND_ZOOM); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 356 | } |
| 357 | |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 358 | public void beginScale(float focusX, float focusY) { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 359 | Box b = mBoxes.get(0); |
| 360 | Platform p = mPlatform; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 361 | mInScale = true; |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 362 | mFocusX = (int) ((focusX - p.mCurrentX) / b.mCurrentScale + 0.5f); |
| 363 | mFocusY = (int) ((focusY - b.mCurrentY) / b.mCurrentScale + 0.5f); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 364 | } |
| 365 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 366 | // Scales the image by the given factor. |
| 367 | // Returns an out-of-range indicator: |
| 368 | // 1 if the intended scale is too large for the stable range. |
| 369 | // 0 if the intended scale is in the stable range. |
| 370 | // -1 if the intended scale is too small for the stable range. |
| 371 | public int scaleBy(float s, float focusX, float focusY) { |
| 372 | Box b = mBoxes.get(0); |
| 373 | Platform p = mPlatform; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 374 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 375 | // We want to keep the focus point (on the bitmap) the same as when we |
| 376 | // begin the scale guesture, that is, |
Chih-Chung Chang | 676170e | 2011-09-30 18:33:17 +0800 | [diff] [blame] | 377 | // |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 378 | // (focusX' - currentX') / scale' = (focusX - currentX) / scale |
Chih-Chung Chang | 676170e | 2011-09-30 18:33:17 +0800 | [diff] [blame] | 379 | // |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 380 | s *= getTargetScale(b); |
| 381 | int x = mFilmMode ? p.mCurrentX : (int) (focusX - s * mFocusX + 0.5f); |
| 382 | int y = mFilmMode ? b.mCurrentY : (int) (focusY - s * mFocusY + 0.5f); |
Chih-Chung Chang | 676170e | 2011-09-30 18:33:17 +0800 | [diff] [blame] | 383 | startAnimation(x, y, s, ANIM_KIND_SCALE); |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 384 | if (s < b.mScaleMin) return -1; |
| 385 | if (s > b.mScaleMax) return 1; |
| 386 | return 0; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | public void endScale() { |
| 390 | mInScale = false; |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 391 | snapAndRedraw(); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | public void startHorizontalSlide(int distance) { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 395 | Box b = mBoxes.get(0); |
| 396 | Platform p = mPlatform; |
| 397 | startAnimation(getTargetX(p) + distance, getTargetY(b), |
| 398 | b.mCurrentScale, ANIM_KIND_SLIDE); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 399 | } |
| 400 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 401 | public void startScroll(float dx, float dy) { |
| 402 | boolean hasPrev = hasPrevImages(); |
| 403 | boolean hasNext = hasNextImages(); |
| 404 | |
| 405 | Box b = mBoxes.get(0); |
| 406 | Platform p = mPlatform; |
| 407 | |
| 408 | int x = getTargetX(p) + (int) (dx + 0.5f); |
| 409 | int y = getTargetY(b) + (int) (dy + 0.5f); |
| 410 | |
| 411 | if (mFilmMode) { |
| 412 | scrollToFilm(x, y, hasPrev, hasNext); |
| 413 | } else { |
| 414 | scrollToPage(x, y, hasPrev, hasNext); |
| 415 | } |
Chih-Chung Chang | 676170e | 2011-09-30 18:33:17 +0800 | [diff] [blame] | 416 | } |
| 417 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 418 | private void scrollToPage(int x, int y, boolean hasPrev, boolean hasNext) { |
| 419 | Box b = mBoxes.get(0); |
Chih-Chung Chang | 532d93c | 2011-10-12 17:10:33 +0800 | [diff] [blame] | 420 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 421 | calculateStableBound(b.mCurrentScale); |
Chih-Chung Chang | 532d93c | 2011-10-12 17:10:33 +0800 | [diff] [blame] | 422 | |
| 423 | // Vertical direction: If we have space to move in the vertical |
| 424 | // direction, we show the edge effect when scrolling reaches the edge. |
| 425 | if (mBoundTop != mBoundBottom) { |
| 426 | if (y < mBoundTop) { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 427 | mListener.onPull(mBoundTop - y, EdgeView.BOTTOM); |
Chih-Chung Chang | 532d93c | 2011-10-12 17:10:33 +0800 | [diff] [blame] | 428 | } else if (y > mBoundBottom) { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 429 | mListener.onPull(y - mBoundBottom, EdgeView.TOP); |
Chih-Chung Chang | 532d93c | 2011-10-12 17:10:33 +0800 | [diff] [blame] | 430 | } |
| 431 | } |
| 432 | |
| 433 | y = Utils.clamp(y, mBoundTop, mBoundBottom); |
| 434 | |
| 435 | // Horizontal direction: we show the edge effect when the scrolling |
| 436 | // tries to go left of the first image or go right of the last image. |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 437 | if (!hasPrev && x > mBoundRight) { |
| 438 | int pixels = x - mBoundRight; |
| 439 | mListener.onPull(pixels, EdgeView.LEFT); |
Chih-Chung Chang | 532d93c | 2011-10-12 17:10:33 +0800 | [diff] [blame] | 440 | x = mBoundRight; |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 441 | } else if (!hasNext && x < mBoundLeft) { |
| 442 | int pixels = mBoundLeft - x; |
| 443 | mListener.onPull(pixels, EdgeView.RIGHT); |
| 444 | x = mBoundLeft; |
Chih-Chung Chang | 532d93c | 2011-10-12 17:10:33 +0800 | [diff] [blame] | 445 | } |
| 446 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 447 | startAnimation(x, y, b.mCurrentScale, ANIM_KIND_SCROLL); |
| 448 | } |
| 449 | |
| 450 | private void scrollToFilm(int x, int y, boolean hasPrev, boolean hasNext) { |
| 451 | Box b = mBoxes.get(0); |
| 452 | |
| 453 | // Horizontal direction: we show the edge effect when the scrolling |
| 454 | // tries to go left of the first image or go right of the last image. |
| 455 | int cx = mViewW / 2; |
| 456 | if (!hasPrev && x > cx) { |
| 457 | int pixels = x - cx; |
| 458 | mListener.onPull(pixels, EdgeView.LEFT); |
| 459 | x = cx; |
| 460 | } else if (!hasNext && x < cx) { |
| 461 | int pixels = cx - x; |
| 462 | mListener.onPull(pixels, EdgeView.RIGHT); |
| 463 | x = cx; |
| 464 | } |
| 465 | |
| 466 | startAnimation(x, y, b.mCurrentScale, ANIM_KIND_SCROLL); |
Chih-Chung Chang | 532d93c | 2011-10-12 17:10:33 +0800 | [diff] [blame] | 467 | } |
| 468 | |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 469 | public boolean fling(float velocityX, float velocityY) { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 470 | int vx = (int) (velocityX + 0.5f); |
| 471 | int vy = (int) (velocityY + 0.5f); |
| 472 | return mFilmMode ? flingFilm(vx, vy) : flingPage(vx, vy); |
| 473 | } |
| 474 | |
| 475 | private boolean flingPage(int velocityX, int velocityY) { |
| 476 | Box b = mBoxes.get(0); |
| 477 | Platform p = mPlatform; |
| 478 | |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 479 | // We only want to do fling when the picture is zoomed-in. |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 480 | if (viewWiderThanScaledImage(b.mCurrentScale) && |
| 481 | viewTallerThanScaledImage(b.mCurrentScale)) { |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 482 | return false; |
| 483 | } |
| 484 | |
Yuli Huang | 2ce3c3b | 2012-02-23 22:26:12 +0800 | [diff] [blame] | 485 | // We only allow flinging in the directions where it won't go over the |
| 486 | // picture. |
| 487 | int edges = getImageAtEdges(); |
| 488 | if ((velocityX > 0 && (edges & IMAGE_AT_LEFT_EDGE) != 0) || |
| 489 | (velocityX < 0 && (edges & IMAGE_AT_RIGHT_EDGE) != 0)) { |
| 490 | velocityX = 0; |
| 491 | } |
| 492 | if ((velocityY > 0 && (edges & IMAGE_AT_TOP_EDGE) != 0) || |
| 493 | (velocityY < 0 && (edges & IMAGE_AT_BOTTOM_EDGE) != 0)) { |
| 494 | velocityY = 0; |
| 495 | } |
Yuli Huang | 2ce3c3b | 2012-02-23 22:26:12 +0800 | [diff] [blame] | 496 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 497 | if (velocityX == 0 && velocityY == 0) return false; |
| 498 | |
| 499 | mPageScroller.fling(p.mCurrentX, b.mCurrentY, velocityX, velocityY, |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 500 | mBoundLeft, mBoundRight, mBoundTop, mBoundBottom); |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 501 | int targetX = mPageScroller.getFinalX(); |
| 502 | int targetY = mPageScroller.getFinalY(); |
| 503 | ANIM_TIME[ANIM_KIND_FLING] = mPageScroller.getDuration(); |
| 504 | startAnimation(targetX, targetY, b.mCurrentScale, ANIM_KIND_FLING); |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 505 | return true; |
| 506 | } |
| 507 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 508 | private boolean flingFilm(int velocityX, int velocityY) { |
| 509 | boolean hasPrev = hasPrevImages(); |
| 510 | boolean hasNext = hasNextImages(); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 511 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 512 | Box b = mBoxes.get(0); |
| 513 | Platform p = mPlatform; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 514 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 515 | // If we are already at the edge, don't start the fling. |
| 516 | int cx = mViewW / 2; |
| 517 | if ((!hasPrev && p.mCurrentX >= cx) || (!hasNext && p.mCurrentX <= cx)) { |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 518 | return false; |
| 519 | } |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 520 | |
| 521 | if (velocityX == 0) return false; |
| 522 | |
| 523 | mFilmScroller.fling(p.mCurrentX, 0, velocityX, 0, |
| 524 | Integer.MIN_VALUE, Integer.MAX_VALUE, 0, 0); |
| 525 | int targetX = mFilmScroller.getFinalX(); |
| 526 | ANIM_TIME[ANIM_KIND_FLING] = mFilmScroller.getDuration(); |
| 527 | startAnimation(targetX, b.mCurrentY, b.mCurrentScale, ANIM_KIND_FLING); |
| 528 | return true; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 529 | } |
| 530 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 531 | //////////////////////////////////////////////////////////////////////////// |
| 532 | // Redraw |
| 533 | // |
| 534 | // If a method changes box positions directly, redraw() |
| 535 | // should be called. |
| 536 | // |
| 537 | // If a method may also cause a snapback to happen, snapAndRedraw() should |
| 538 | // be called. |
| 539 | // |
| 540 | // If a method starts an animation to change the position of focused box, |
| 541 | // startAnimation() should be called. |
| 542 | // |
| 543 | // If time advances to change the box position, advanceAnimation() should |
| 544 | // be called. |
| 545 | //////////////////////////////////////////////////////////////////////////// |
| 546 | private void redraw() { |
| 547 | layoutAndSetPosition(); |
| 548 | mListener.invalidate(); |
| 549 | } |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 550 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 551 | private void snapAndRedraw() { |
| 552 | mPlatform.startSnapback(); |
| 553 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 554 | mBoxes.get(i).startSnapback(); |
| 555 | } |
| 556 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 557 | mGaps.get(i).startSnapback(); |
| 558 | } |
| 559 | redraw(); |
| 560 | } |
Chih-Chung Chang | 534b12f | 2012-03-21 19:01:30 +0800 | [diff] [blame] | 561 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 562 | private void startAnimation(int targetX, int targetY, float targetScale, |
| 563 | int kind) { |
| 564 | boolean changed = false; |
| 565 | changed |= mPlatform.doAnimation(targetX, kind); |
| 566 | changed |= mBoxes.get(0).doAnimation(targetY, targetScale, kind); |
| 567 | if (changed) redraw(); |
| 568 | } |
| 569 | |
| 570 | public boolean advanceAnimation() { |
| 571 | boolean changed = false; |
| 572 | changed |= mPlatform.advanceAnimation(); |
| 573 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 574 | changed |= mBoxes.get(i).advanceAnimation(); |
| 575 | } |
| 576 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 577 | changed |= mGaps.get(i).advanceAnimation(); |
| 578 | } |
| 579 | if (changed) redraw(); |
| 580 | return changed; |
| 581 | } |
| 582 | |
| 583 | //////////////////////////////////////////////////////////////////////////// |
| 584 | // Layout |
| 585 | //////////////////////////////////////////////////////////////////////////// |
| 586 | |
| 587 | // Returns the display width of this box. |
| 588 | private int widthOf(Box b) { |
| 589 | return (int) (b.mImageW * b.mCurrentScale + 0.5f); |
| 590 | } |
| 591 | |
| 592 | // Returns the display height of this box. |
| 593 | private int heightOf(Box b) { |
| 594 | return (int) (b.mImageH * b.mCurrentScale + 0.5f); |
| 595 | } |
| 596 | |
| 597 | // Returns the display width of this box, using the given scale. |
| 598 | private int widthOf(Box b, float scale) { |
| 599 | return (int) (b.mImageW * scale + 0.5f); |
| 600 | } |
| 601 | |
| 602 | // Returns the display height of this box, using the given scale. |
| 603 | private int heightOf(Box b, float scale) { |
| 604 | return (int) (b.mImageH * scale + 0.5f); |
| 605 | } |
| 606 | |
| 607 | // Convert the information in mPlatform and mBoxes to mRects, so the user |
| 608 | // can get the position of each box by getPosition(). |
| 609 | // |
| 610 | // Note the loop index goes from inside-out because each box's X coordinate |
| 611 | // is relative to its anchor box (except the focused box). |
| 612 | private void layoutAndSetPosition() { |
| 613 | // layout box 0 (focused box) |
| 614 | convertBoxToRect(0); |
| 615 | for (int i = 1; i <= BOX_MAX; i++) { |
| 616 | // layout box i and -i |
| 617 | convertBoxToRect(i); |
| 618 | convertBoxToRect(-i); |
| 619 | } |
| 620 | //dumpState(); |
| 621 | } |
| 622 | |
| 623 | private void dumpState() { |
| 624 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 625 | Log.d(TAG, "Gap " + i + ": " + mGaps.get(i).mCurrentGap); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 626 | } |
| 627 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 628 | dumpRect(0); |
| 629 | for (int i = 1; i <= BOX_MAX; i++) { |
| 630 | dumpRect(i); |
| 631 | dumpRect(-i); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 632 | } |
| 633 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 634 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 635 | for (int j = i + 1; j <= BOX_MAX; j++) { |
| 636 | if (Rect.intersects(mRects.get(i), mRects.get(j))) { |
| 637 | Log.d(TAG, "rect " + i + " and rect " + j + "intersects!"); |
| 638 | } |
| 639 | } |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | private void dumpRect(int i) { |
| 644 | StringBuilder sb = new StringBuilder(); |
| 645 | Rect r = mRects.get(i); |
| 646 | sb.append("Rect " + i + ":"); |
| 647 | sb.append("("); |
| 648 | sb.append(r.centerX()); |
| 649 | sb.append(","); |
| 650 | sb.append(r.centerY()); |
| 651 | sb.append(") ["); |
| 652 | sb.append(r.width()); |
| 653 | sb.append("x"); |
| 654 | sb.append(r.height()); |
| 655 | sb.append("]"); |
| 656 | Log.d(TAG, sb.toString()); |
| 657 | } |
| 658 | |
| 659 | private void convertBoxToRect(int i) { |
| 660 | Box b = mBoxes.get(i); |
| 661 | Rect r = mRects.get(i); |
| 662 | int y = b.mCurrentY; |
| 663 | int w = widthOf(b); |
| 664 | int h = heightOf(b); |
| 665 | if (i == 0) { |
| 666 | int x = mPlatform.mCurrentX; |
| 667 | r.left = x - w / 2; |
| 668 | r.right = r.left + w; |
| 669 | } else if (i > 0) { |
| 670 | Rect a = mRects.get(i - 1); |
| 671 | Gap g = mGaps.get(i - 1); |
| 672 | r.left = a.right + g.mCurrentGap; |
| 673 | r.right = r.left + w; |
| 674 | } else { // i < 0 |
| 675 | Rect a = mRects.get(i + 1); |
| 676 | Gap g = mGaps.get(i); |
| 677 | r.right = a.left - g.mCurrentGap; |
| 678 | r.left = r.right - w; |
| 679 | } |
| 680 | r.top = y - h / 2; |
| 681 | r.bottom = r.top + h; |
| 682 | } |
| 683 | |
| 684 | // Returns the position of a box. |
| 685 | public Rect getPosition(int index) { |
| 686 | return mRects.get(index); |
| 687 | } |
| 688 | |
| 689 | //////////////////////////////////////////////////////////////////////////// |
| 690 | // Box management |
| 691 | //////////////////////////////////////////////////////////////////////////// |
| 692 | |
| 693 | // Initialize the platform to be at the view center. |
| 694 | private void initPlatform() { |
| 695 | mPlatform.mCurrentX = mViewW / 2; |
| 696 | mPlatform.mAnimationStartTime = NO_ANIMATION; |
| 697 | } |
| 698 | |
| 699 | // Initialize a box to have the size of the view. |
| 700 | private void initBox(int index) { |
| 701 | Box b = mBoxes.get(index); |
| 702 | b.mImageW = mViewW; |
| 703 | b.mImageH = mViewH; |
| 704 | b.mUseViewSize = true; |
| 705 | b.mScaleMin = getMinimalScale(b.mImageW, b.mImageH); |
| 706 | b.mScaleMax = getMaximalScale(b.mImageW, b.mImageH); |
| 707 | b.mCurrentY = mViewH / 2; |
| 708 | b.mCurrentScale = b.mScaleMin; |
| 709 | b.mAnimationStartTime = NO_ANIMATION; |
| 710 | } |
| 711 | |
| 712 | // Initialize a gap. This can only be called after the boxes around the gap |
| 713 | // has been initialized. |
| 714 | private void initGap(int index) { |
| 715 | Gap g = mGaps.get(index); |
| 716 | g.mDefaultSize = getDefaultGapSize(index); |
| 717 | g.mCurrentGap = g.mDefaultSize; |
| 718 | g.mAnimationStartTime = NO_ANIMATION; |
| 719 | } |
| 720 | |
| 721 | private void initGap(int index, int size) { |
| 722 | Gap g = mGaps.get(index); |
| 723 | g.mDefaultSize = getDefaultGapSize(index); |
| 724 | g.mCurrentGap = size; |
| 725 | g.mAnimationStartTime = NO_ANIMATION; |
| 726 | } |
| 727 | |
| 728 | private void debugMoveBox(int fromIndex[]) { |
| 729 | StringBuilder s = new StringBuilder("moveBox:"); |
| 730 | for (int i = 0; i < fromIndex.length; i++) { |
| 731 | int j = fromIndex[i]; |
| 732 | if (j == Integer.MAX_VALUE) { |
| 733 | s.append(" N"); |
| 734 | } else { |
| 735 | s.append(" "); |
| 736 | s.append(fromIndex[i]); |
| 737 | } |
| 738 | } |
| 739 | Log.d(TAG, s.toString()); |
| 740 | } |
| 741 | |
| 742 | // Move the boxes: it may indicate focus change, box deleted, box appearing, |
| 743 | // box reordered, etc. |
| 744 | // |
| 745 | // Each element in the fromIndex array indicates where each box was in the |
| 746 | // old array. If the value is Integer.MAX_VALUE (pictured as N below), it |
| 747 | // means the box is new. |
| 748 | // |
| 749 | // For example: |
| 750 | // N N N N N N N -- all new boxes |
| 751 | // -3 -2 -1 0 1 2 3 -- nothing changed |
| 752 | // -2 -1 0 1 2 3 N -- focus goes to the next box |
| 753 | // N-3 -2 -1 0 1 2 -- focuse goes to the previous box |
| 754 | // -3 -2 -1 1 2 3 N -- the focused box was deleted. |
| 755 | public void moveBox(int fromIndex[]) { |
| 756 | //debugMoveBox(fromIndex); |
| 757 | RangeIntArray from = new RangeIntArray(fromIndex, -BOX_MAX, BOX_MAX); |
| 758 | |
| 759 | // 1. Get the absolute X coordiates for the boxes. |
| 760 | layoutAndSetPosition(); |
| 761 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 762 | Box b = mBoxes.get(i); |
| 763 | Rect r = mRects.get(i); |
| 764 | b.mAbsoluteX = r.centerX(); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 765 | } |
| 766 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 767 | // 2. copy boxes and gaps to temporary storage. |
| 768 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 769 | mTempBoxes.put(i, mBoxes.get(i)); |
| 770 | mBoxes.put(i, null); |
| 771 | } |
| 772 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 773 | mTempGaps.put(i, mGaps.get(i)); |
| 774 | mGaps.put(i, null); |
| 775 | } |
| 776 | |
| 777 | // 3. move back boxes that are used in the new array. |
| 778 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 779 | int j = from.get(i); |
| 780 | if (j == Integer.MAX_VALUE) continue; |
| 781 | mBoxes.put(i, mTempBoxes.get(j)); |
| 782 | mTempBoxes.put(j, null); |
| 783 | } |
| 784 | |
| 785 | // 4. move back gaps if both boxes around it are kept together. |
| 786 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 787 | int j = from.get(i); |
| 788 | if (j == Integer.MAX_VALUE) continue; |
| 789 | int k = from.get(i + 1); |
| 790 | if (k == Integer.MAX_VALUE) continue; |
| 791 | if (j + 1 == k) { |
| 792 | mGaps.put(i, mTempGaps.get(j)); |
| 793 | mTempGaps.put(j, null); |
| 794 | } |
| 795 | } |
| 796 | |
| 797 | // 5. recycle the boxes that are not used in the new array. |
| 798 | int k = -BOX_MAX; |
| 799 | for (int i = -BOX_MAX; i <= BOX_MAX; i++) { |
| 800 | if (mBoxes.get(i) != null) continue; |
| 801 | while (mTempBoxes.get(k) == null) { |
| 802 | k++; |
| 803 | } |
| 804 | mBoxes.put(i, mTempBoxes.get(k++)); |
| 805 | initBox(i); |
| 806 | } |
| 807 | |
| 808 | // 6. Now give the recycled box a reasonable absolute X position. |
| 809 | // |
| 810 | // First try to find the first and the last box which the absolute X |
| 811 | // position is known. |
| 812 | int first, last; |
| 813 | for (first = -BOX_MAX; first <= BOX_MAX; first++) { |
| 814 | if (from.get(first) != Integer.MAX_VALUE) break; |
| 815 | } |
| 816 | for (last = BOX_MAX; last >= -BOX_MAX; last--) { |
| 817 | if (from.get(last) != Integer.MAX_VALUE) break; |
| 818 | } |
| 819 | // If there is no box has known X position at all, make the focused one |
| 820 | // as known. |
| 821 | if (first > BOX_MAX) { |
| 822 | mBoxes.get(0).mAbsoluteX = mPlatform.mCurrentX; |
| 823 | first = last = 0; |
| 824 | } |
| 825 | // Now for those boxes between first and last, just assign the same |
| 826 | // position as the previous box. (We can do better, but this should be |
| 827 | // rare). For the boxes before first or after last, we will use a new |
| 828 | // default gap size below. |
| 829 | for (int i = first + 1; i < last; i++) { |
| 830 | if (from.get(i) != Integer.MAX_VALUE) continue; |
| 831 | mBoxes.get(i).mAbsoluteX = mBoxes.get(i - 1).mAbsoluteX; |
| 832 | } |
| 833 | |
| 834 | // 7. recycle the gaps that are not used in the new array. |
| 835 | k = -BOX_MAX; |
| 836 | for (int i = -BOX_MAX; i < BOX_MAX; i++) { |
| 837 | if (mGaps.get(i) != null) continue; |
| 838 | while (mTempGaps.get(k) == null) { |
| 839 | k++; |
| 840 | } |
| 841 | mGaps.put(i, mTempGaps.get(k++)); |
| 842 | Box a = mBoxes.get(i); |
| 843 | Box b = mBoxes.get(i + 1); |
| 844 | int wa = widthOf(a); |
| 845 | int wb = widthOf(b); |
| 846 | if (i >= first && i < last) { |
| 847 | int g = b.mAbsoluteX - a.mAbsoluteX - wb / 2 - (wa - wa / 2); |
| 848 | initGap(i, g); |
| 849 | } else { |
| 850 | initGap(i); |
| 851 | } |
| 852 | } |
| 853 | |
| 854 | // 8. offset the Platform position |
| 855 | int dx = mBoxes.get(0).mAbsoluteX - mPlatform.mCurrentX; |
| 856 | mPlatform.mCurrentX += dx; |
| 857 | mPlatform.mFromX += dx; |
| 858 | mPlatform.mToX += dx; |
| 859 | mPlatform.mFlingOffset += dx; |
| 860 | |
| 861 | snapAndRedraw(); |
| 862 | } |
| 863 | |
| 864 | //////////////////////////////////////////////////////////////////////////// |
| 865 | // Public utilities |
| 866 | //////////////////////////////////////////////////////////////////////////// |
| 867 | |
| 868 | public float getMinimalScale(int imageW, int imageH) { |
| 869 | float s = Math.min(mScaleFactor * mViewW / imageW, |
| 870 | mScaleFactor * mViewH / imageH); |
| 871 | return Math.min(SCALE_LIMIT, s); |
| 872 | } |
| 873 | |
| 874 | public float getMaximalScale(int imageW, int imageH) { |
| 875 | return mFilmMode ? getMinimalScale(imageW, imageH) : SCALE_LIMIT; |
| 876 | } |
| 877 | |
| 878 | public boolean isAtMinimalScale() { |
| 879 | Box b = mBoxes.get(0); |
| 880 | return isAlmostEqual(b.mCurrentScale, b.mScaleMin); |
| 881 | } |
| 882 | |
| 883 | public int getImageWidth() { |
| 884 | Box b = mBoxes.get(0); |
| 885 | return b.mImageW; |
| 886 | } |
| 887 | |
| 888 | public int getImageHeight() { |
| 889 | Box b = mBoxes.get(0); |
| 890 | return b.mImageH; |
| 891 | } |
| 892 | |
| 893 | public float getImageScale() { |
| 894 | Box b = mBoxes.get(0); |
| 895 | return b.mCurrentScale; |
| 896 | } |
| 897 | |
| 898 | public int getImageAtEdges() { |
| 899 | Box b = mBoxes.get(0); |
| 900 | Platform p = mPlatform; |
| 901 | calculateStableBound(b.mCurrentScale); |
| 902 | int edges = 0; |
| 903 | if (p.mCurrentX <= mBoundLeft) { |
| 904 | edges |= IMAGE_AT_RIGHT_EDGE; |
| 905 | } |
| 906 | if (p.mCurrentX >= mBoundRight) { |
| 907 | edges |= IMAGE_AT_LEFT_EDGE; |
| 908 | } |
| 909 | if (b.mCurrentY <= mBoundTop) { |
| 910 | edges |= IMAGE_AT_BOTTOM_EDGE; |
| 911 | } |
| 912 | if (b.mCurrentY >= mBoundBottom) { |
| 913 | edges |= IMAGE_AT_TOP_EDGE; |
| 914 | } |
| 915 | return edges; |
| 916 | } |
| 917 | |
| 918 | //////////////////////////////////////////////////////////////////////////// |
| 919 | // Private utilities |
| 920 | //////////////////////////////////////////////////////////////////////////// |
| 921 | |
| 922 | private float getMinimalScale(Box b) { |
| 923 | return getMinimalScale(b.mImageW, b.mImageH); |
| 924 | } |
| 925 | |
| 926 | private float getMaxmimalScale(Box b) { |
| 927 | return getMaximalScale(b.mImageW, b.mImageH); |
| 928 | } |
| 929 | |
| 930 | private static boolean isAlmostEqual(float a, float b) { |
| 931 | float diff = a - b; |
| 932 | return (diff < 0 ? -diff : diff) < 0.02f; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 933 | } |
| 934 | |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 935 | // Calculates the stable region of mCurrent{X/Y}, where "stable" means |
| 936 | // |
| 937 | // (1) If the dimension of scaled image >= view dimension, we will not |
| 938 | // see black region outside the image (at that dimension). |
| 939 | // (2) If the dimension of scaled image < view dimension, we will center |
| 940 | // the scaled image. |
| 941 | // |
| 942 | // We might temporarily go out of this stable during user interaction, |
| 943 | // but will "snap back" after user stops interaction. |
| 944 | // |
| 945 | // The results are stored in mBound{Left/Right/Top/Bottom}. |
| 946 | // |
Chih-Chung Chang | 8f568da | 2012-01-05 12:00:53 +0800 | [diff] [blame] | 947 | // An extra parameter "horizontalSlack" (which has the value of 0 usually) |
| 948 | // is used to extend the stable region by some pixels on each side |
| 949 | // horizontally. |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 950 | private void calculateStableBound(float scale, int horizontalSlack) { |
| 951 | Box b = mBoxes.get(0); |
Chih-Chung Chang | 8f568da | 2012-01-05 12:00:53 +0800 | [diff] [blame] | 952 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 953 | // The width and height of the box in number of view pixels |
| 954 | int w = widthOf(b, scale); |
| 955 | int h = heightOf(b, scale); |
| 956 | |
| 957 | // When the edge of the view is aligned with the edge of the box |
| 958 | mBoundLeft = (mViewW - horizontalSlack) - w / 2; |
| 959 | mBoundRight = mViewW - mBoundLeft; |
| 960 | mBoundTop = mViewH - h / 2; |
| 961 | mBoundBottom = mViewH - mBoundTop; |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 962 | |
| 963 | // If the scaled height is smaller than the view height, |
| 964 | // force it to be in the center. |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 965 | if (viewTallerThanScaledImage(scale)) { |
| 966 | mBoundTop = mBoundBottom = mViewH / 2; |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 967 | } |
| 968 | |
| 969 | // Same for width |
Yuli Huang | 2ce3c3b | 2012-02-23 22:26:12 +0800 | [diff] [blame] | 970 | if (viewWiderThanScaledImage(scale)) { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 971 | mBoundLeft = mBoundRight = mViewW / 2; |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 972 | } |
| 973 | } |
| 974 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 975 | private void calculateStableBound(float scale) { |
| 976 | calculateStableBound(scale, 0); |
| 977 | } |
| 978 | |
| 979 | private boolean hasNextImages() { |
| 980 | for (int i = 1; i <= BOX_MAX; i++) { |
| 981 | if (!mBoxes.get(i).mUseViewSize) return true; |
| 982 | } |
| 983 | return false; |
| 984 | } |
| 985 | |
| 986 | private boolean hasPrevImages() { |
| 987 | for (int i = -1; i >= -BOX_MAX; i--) { |
| 988 | if (!mBoxes.get(i).mUseViewSize) return true; |
| 989 | } |
| 990 | return false; |
| 991 | } |
| 992 | |
| 993 | private boolean viewTallerThanScaledImage(float scale) { |
| 994 | return mViewH >= heightOf(mBoxes.get(0), scale); |
Yuli Huang | 2ce3c3b | 2012-02-23 22:26:12 +0800 | [diff] [blame] | 995 | } |
| 996 | |
| 997 | private boolean viewWiderThanScaledImage(float scale) { |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 998 | return mViewW >= widthOf(mBoxes.get(0), scale); |
Yuli Huang | 2ce3c3b | 2012-02-23 22:26:12 +0800 | [diff] [blame] | 999 | } |
| 1000 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1001 | private float getTargetScale(Box b) { |
| 1002 | return useCurrentValueAsTarget(b) ? b.mCurrentScale : b.mToScale; |
Chih-Chung Chang | b3aab90 | 2011-10-03 21:11:39 +0800 | [diff] [blame] | 1003 | } |
| 1004 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1005 | private int getTargetX(Platform p) { |
| 1006 | return useCurrentValueAsTarget(p) ? p.mCurrentX : p.mToX; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1007 | } |
| 1008 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1009 | private int getTargetY(Box b) { |
| 1010 | return useCurrentValueAsTarget(b) ? b.mCurrentY : b.mToY; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1011 | } |
| 1012 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1013 | private boolean useCurrentValueAsTarget(Animatable a) { |
| 1014 | return a.mAnimationStartTime == NO_ANIMATION || |
| 1015 | a.mAnimationKind == ANIM_KIND_SNAPBACK || |
| 1016 | a.mAnimationKind == ANIM_KIND_FLING; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1017 | } |
| 1018 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1019 | // Returns the index of the anchor box. |
| 1020 | private int anchorIndex(int i) { |
| 1021 | if (i > 0) return i - 1; |
| 1022 | if (i < 0) return i + 1; |
| 1023 | throw new IllegalArgumentException(); |
| 1024 | } |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1025 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1026 | //////////////////////////////////////////////////////////////////////////// |
| 1027 | // Animatable: an thing which can do animation. |
| 1028 | //////////////////////////////////////////////////////////////////////////// |
| 1029 | private abstract static class Animatable { |
| 1030 | public long mAnimationStartTime; |
| 1031 | public int mAnimationKind; |
| 1032 | public int mAnimationDuration; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1033 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1034 | // This should be overidden in subclass to change the animation values |
| 1035 | // give the progress value in [0, 1]. |
| 1036 | protected abstract boolean interpolate(float progress); |
| 1037 | public abstract boolean startSnapback(); |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1038 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1039 | // Returns true if the animation values changes, so things need to be |
| 1040 | // redrawn. |
| 1041 | public boolean advanceAnimation() { |
| 1042 | if (mAnimationStartTime == NO_ANIMATION) { |
| 1043 | return false; |
| 1044 | } |
| 1045 | if (mAnimationStartTime == LAST_ANIMATION) { |
| 1046 | mAnimationStartTime = NO_ANIMATION; |
| 1047 | return startSnapback(); |
| 1048 | } |
| 1049 | |
| 1050 | float progress; |
| 1051 | if (mAnimationDuration == 0) { |
| 1052 | progress = 1; |
| 1053 | } else { |
| 1054 | long now = AnimationTime.get(); |
| 1055 | progress = |
| 1056 | (float) (now - mAnimationStartTime) / mAnimationDuration; |
| 1057 | } |
| 1058 | |
| 1059 | if (progress >= 1) { |
| 1060 | progress = 1; |
| 1061 | } else { |
| 1062 | progress = applyInterpolationCurve(mAnimationKind, progress); |
| 1063 | } |
| 1064 | |
| 1065 | boolean done = interpolate(progress); |
| 1066 | |
| 1067 | if (done) { |
| 1068 | mAnimationStartTime = LAST_ANIMATION; |
| 1069 | } |
| 1070 | |
| 1071 | return true; |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1072 | } |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1073 | |
| 1074 | private static float applyInterpolationCurve(int kind, float progress) { |
| 1075 | float f = 1 - progress; |
| 1076 | switch (kind) { |
| 1077 | case ANIM_KIND_SCROLL: |
| 1078 | case ANIM_KIND_FLING: |
| 1079 | progress = 1 - f; // linear |
| 1080 | break; |
| 1081 | case ANIM_KIND_SCALE: |
| 1082 | progress = 1 - f * f; // quadratic |
| 1083 | break; |
| 1084 | case ANIM_KIND_SNAPBACK: |
| 1085 | case ANIM_KIND_ZOOM: |
| 1086 | case ANIM_KIND_SLIDE: |
| 1087 | case ANIM_KIND_OPENING: |
| 1088 | progress = 1 - f * f * f * f * f; // x^5 |
| 1089 | break; |
| 1090 | } |
| 1091 | return progress; |
| 1092 | } |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1093 | } |
| 1094 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1095 | //////////////////////////////////////////////////////////////////////////// |
| 1096 | // Platform: captures the global X movement. |
| 1097 | //////////////////////////////////////////////////////////////////////////// |
| 1098 | private class Platform extends Animatable { |
| 1099 | public int mCurrentX, mFromX, mToX; |
| 1100 | public int mFlingOffset; |
| 1101 | |
| 1102 | @Override |
| 1103 | public boolean startSnapback() { |
| 1104 | if (mAnimationStartTime != NO_ANIMATION) return false; |
| 1105 | if (mAnimationKind == ANIM_KIND_SCROLL |
| 1106 | && mListener.isDown()) return false; |
| 1107 | |
| 1108 | Box b = mBoxes.get(0); |
| 1109 | float scaleMin = mExtraScalingRange ? |
| 1110 | b.mScaleMin * SCALE_MIN_EXTRA : b.mScaleMin; |
| 1111 | float scaleMax = mExtraScalingRange ? |
| 1112 | b.mScaleMax * SCALE_MAX_EXTRA : b.mScaleMax; |
| 1113 | float scale = Utils.clamp(b.mCurrentScale, scaleMin, scaleMax); |
| 1114 | int x = mCurrentX; |
| 1115 | if (mFilmMode) { |
| 1116 | if (!hasNextImages()) x = Math.max(x, mViewW / 2); |
| 1117 | if (!hasPrevImages()) x = Math.min(x, mViewW / 2); |
| 1118 | } else { |
| 1119 | calculateStableBound(scale, HORIZONTAL_SLACK); |
| 1120 | x = Utils.clamp(x, mBoundLeft, mBoundRight); |
| 1121 | } |
| 1122 | if (mCurrentX != x) { |
| 1123 | return doAnimation(x, ANIM_KIND_SNAPBACK); |
| 1124 | } |
| 1125 | return false; |
| 1126 | } |
| 1127 | |
| 1128 | // Starts an animation for the platform. |
| 1129 | public boolean doAnimation(int targetX, int kind) { |
| 1130 | if (mCurrentX == targetX) return false; |
| 1131 | mAnimationKind = kind; |
| 1132 | mFromX = mCurrentX; |
| 1133 | mToX = targetX; |
| 1134 | mAnimationStartTime = AnimationTime.startTime(); |
| 1135 | mAnimationDuration = ANIM_TIME[kind]; |
| 1136 | mFlingOffset = 0; |
| 1137 | advanceAnimation(); |
| 1138 | return true; |
| 1139 | } |
| 1140 | |
| 1141 | @Override |
| 1142 | protected boolean interpolate(float progress) { |
| 1143 | if (mAnimationKind == ANIM_KIND_FLING) { |
| 1144 | return mFilmMode |
| 1145 | ? interpolateFlingFilm(progress) |
| 1146 | : interpolateFlingPage(progress); |
| 1147 | } else { |
| 1148 | return interpolateLinear(progress); |
| 1149 | } |
| 1150 | } |
| 1151 | |
| 1152 | private boolean interpolateFlingFilm(float progress) { |
| 1153 | mFilmScroller.computeScrollOffset(); |
| 1154 | mCurrentX = mFilmScroller.getCurrX() + mFlingOffset; |
| 1155 | |
| 1156 | int dir = EdgeView.INVALID_DIRECTION; |
| 1157 | if (mCurrentX < mViewW / 2) { |
| 1158 | if (!hasNextImages()) { |
| 1159 | dir = EdgeView.RIGHT; |
| 1160 | } |
| 1161 | } else if (mCurrentX > mViewW / 2) { |
| 1162 | if (!hasPrevImages()) { |
| 1163 | dir = EdgeView.LEFT; |
| 1164 | } |
| 1165 | } |
| 1166 | if (dir != EdgeView.INVALID_DIRECTION) { |
| 1167 | int v = (int) (mFilmScroller.getCurrVelocity() + 0.5f); |
| 1168 | mListener.onAbsorb(v, dir); |
| 1169 | mFilmScroller.forceFinished(true); |
| 1170 | mCurrentX = mViewW / 2; |
| 1171 | } |
| 1172 | return mFilmScroller.isFinished(); |
| 1173 | } |
| 1174 | |
| 1175 | private boolean interpolateFlingPage(float progress) { |
| 1176 | mPageScroller.computeScrollOffset(progress); |
| 1177 | Box b = mBoxes.get(0); |
| 1178 | calculateStableBound(b.mCurrentScale); |
| 1179 | |
| 1180 | int oldX = mCurrentX; |
| 1181 | mCurrentX = mPageScroller.getCurrX(); |
| 1182 | |
| 1183 | // Check if we hit the edges; show edge effects if we do. |
| 1184 | if (oldX > mBoundLeft && mCurrentX == mBoundLeft) { |
| 1185 | int v = (int) (-mPageScroller.getCurrVelocityX() + 0.5f); |
| 1186 | mListener.onAbsorb(v, EdgeView.RIGHT); |
| 1187 | } else if (oldX < mBoundRight && mCurrentX == mBoundRight) { |
| 1188 | int v = (int) (mPageScroller.getCurrVelocityX() + 0.5f); |
| 1189 | mListener.onAbsorb(v, EdgeView.LEFT); |
| 1190 | } |
| 1191 | |
| 1192 | return progress >= 1; |
| 1193 | } |
| 1194 | |
| 1195 | private boolean interpolateLinear(float progress) { |
| 1196 | // Other animations |
| 1197 | if (progress >= 1) { |
| 1198 | mCurrentX = mToX; |
| 1199 | return true; |
| 1200 | } else { |
| 1201 | mCurrentX = (int) (mFromX + progress * (mToX - mFromX)); |
| 1202 | return (mCurrentX == mToX); |
| 1203 | } |
| 1204 | } |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1205 | } |
| 1206 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1207 | //////////////////////////////////////////////////////////////////////////// |
| 1208 | // Box: represents a rectangular area which shows a picture. |
| 1209 | //////////////////////////////////////////////////////////////////////////// |
| 1210 | private class Box extends Animatable { |
| 1211 | // Size of the bitmap |
| 1212 | public int mImageW, mImageH; |
| 1213 | |
| 1214 | // This is true if we assume the image size is the same as view size |
| 1215 | // until we know the actual size of image. This is also used to |
| 1216 | // determine if there is an image ready to show. |
| 1217 | public boolean mUseViewSize; |
| 1218 | |
| 1219 | // The minimum and maximum scale we allow for this box. |
| 1220 | public float mScaleMin, mScaleMax; |
| 1221 | |
| 1222 | // The X/Y value indicates where the center of the box is on the view |
| 1223 | // coordinate. We always keep the mCurrent{X,Y,Scale} sync with the |
| 1224 | // actual values used currently. Note that the X values are implicitly |
| 1225 | // defined by Platform and Gaps. |
| 1226 | public int mCurrentY, mFromY, mToY; |
| 1227 | public float mCurrentScale, mFromScale, mToScale; |
| 1228 | |
| 1229 | // The absolute X coordinate of the center of the box. This is only used |
| 1230 | // during moveBox(). |
| 1231 | public int mAbsoluteX; |
| 1232 | |
| 1233 | @Override |
| 1234 | public boolean startSnapback() { |
| 1235 | if (mAnimationStartTime != NO_ANIMATION) return false; |
| 1236 | if (mAnimationKind == ANIM_KIND_SCROLL |
| 1237 | && mListener.isDown()) return false; |
| 1238 | if (mInScale && this == mBoxes.get(0)) return false; |
| 1239 | |
| 1240 | int y; |
| 1241 | float scale; |
| 1242 | |
| 1243 | if (this == mBoxes.get(0)) { |
| 1244 | float scaleMin = mExtraScalingRange ? |
| 1245 | mScaleMin * SCALE_MIN_EXTRA : mScaleMin; |
| 1246 | float scaleMax = mExtraScalingRange ? |
| 1247 | mScaleMax * SCALE_MAX_EXTRA : mScaleMax; |
| 1248 | scale = Utils.clamp(mCurrentScale, scaleMin, scaleMax); |
| 1249 | if (mFilmMode) { |
| 1250 | y = mViewH / 2; |
| 1251 | } else { |
| 1252 | calculateStableBound(scale, HORIZONTAL_SLACK); |
| 1253 | y = Utils.clamp(mCurrentY, mBoundTop, mBoundBottom); |
| 1254 | } |
| 1255 | } else { |
| 1256 | y = mViewH / 2; |
| 1257 | scale = mScaleMin; |
| 1258 | } |
| 1259 | |
| 1260 | if (mCurrentY != y || mCurrentScale != scale) { |
| 1261 | return doAnimation(y, scale, ANIM_KIND_SNAPBACK); |
| 1262 | } |
| 1263 | return false; |
| 1264 | } |
| 1265 | |
| 1266 | private boolean doAnimation(int targetY, float targetScale, int kind) { |
| 1267 | targetScale = Utils.clamp(targetScale, |
| 1268 | SCALE_MIN_EXTRA * mScaleMin, |
| 1269 | SCALE_MAX_EXTRA * mScaleMax); |
| 1270 | |
| 1271 | // If the scaled height is smaller than the view height, force it to be |
| 1272 | // in the center. (We do this for height only, not width, because the |
| 1273 | // user may want to scroll to the previous/next image.) |
| 1274 | if (!mInScale && viewTallerThanScaledImage(targetScale)) { |
| 1275 | targetY = mViewH / 2; |
| 1276 | } |
| 1277 | |
| 1278 | if (mCurrentY == targetY && mCurrentScale == targetScale) { |
| 1279 | return false; |
| 1280 | } |
| 1281 | |
| 1282 | // Now starts an animation for the box. |
| 1283 | mAnimationKind = kind; |
| 1284 | mFromY = mCurrentY; |
| 1285 | mFromScale = mCurrentScale; |
| 1286 | mToY = targetY; |
| 1287 | mToScale = targetScale; |
| 1288 | mAnimationStartTime = AnimationTime.startTime(); |
| 1289 | mAnimationDuration = ANIM_TIME[kind]; |
| 1290 | advanceAnimation(); |
| 1291 | return true; |
| 1292 | } |
| 1293 | |
| 1294 | @Override |
| 1295 | protected boolean interpolate(float progress) { |
| 1296 | if (mAnimationKind == ANIM_KIND_FLING) { |
| 1297 | // Currently a Box can only be flung in page mode. |
| 1298 | return interpolateFlingPage(progress); |
| 1299 | } else { |
| 1300 | return interpolateLinear(progress); |
| 1301 | } |
| 1302 | } |
| 1303 | |
| 1304 | private boolean interpolateFlingPage(float progress) { |
| 1305 | mPageScroller.computeScrollOffset(progress); |
| 1306 | calculateStableBound(mCurrentScale); |
| 1307 | |
| 1308 | int oldY = mCurrentY; |
| 1309 | mCurrentY = mPageScroller.getCurrY(); |
| 1310 | |
| 1311 | // Check if we hit the edges; show edge effects if we do. |
| 1312 | if (oldY > mBoundTop && mCurrentY == mBoundTop) { |
| 1313 | int v = (int) (-mPageScroller.getCurrVelocityY() + 0.5f); |
| 1314 | mListener.onAbsorb(v, EdgeView.BOTTOM); |
| 1315 | } else if (oldY < mBoundBottom && mCurrentY == mBoundBottom) { |
| 1316 | int v = (int) (mPageScroller.getCurrVelocityY() + 0.5f); |
| 1317 | mListener.onAbsorb(v, EdgeView.TOP); |
| 1318 | } |
| 1319 | |
| 1320 | return progress >= 1; |
| 1321 | } |
| 1322 | |
| 1323 | private boolean interpolateLinear(float progress) { |
| 1324 | if (progress >= 1) { |
| 1325 | mCurrentY = mToY; |
| 1326 | mCurrentScale = mToScale; |
| 1327 | return true; |
| 1328 | } else { |
| 1329 | mCurrentY = (int) (mFromY + progress * (mToY - mFromY)); |
| 1330 | mCurrentScale = mFromScale + progress * (mToScale - mFromScale); |
| 1331 | return (mCurrentY == mToY && mCurrentScale == mToScale); |
| 1332 | } |
| 1333 | } |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1334 | } |
Chih-Chung Chang | 532d93c | 2011-10-12 17:10:33 +0800 | [diff] [blame] | 1335 | |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1336 | //////////////////////////////////////////////////////////////////////////// |
| 1337 | // Gap: represents a rectangular area which is between two boxes. |
| 1338 | //////////////////////////////////////////////////////////////////////////// |
| 1339 | private class Gap extends Animatable { |
| 1340 | // The default gap size between two boxes. The value may vary for |
| 1341 | // different image size of the boxes and for different modes (page or |
| 1342 | // film). |
| 1343 | public int mDefaultSize; |
| 1344 | |
| 1345 | // The gap size between the two boxes. |
| 1346 | public int mCurrentGap, mFromGap, mToGap; |
| 1347 | |
| 1348 | @Override |
| 1349 | public boolean startSnapback() { |
| 1350 | if (mAnimationStartTime != NO_ANIMATION) return false; |
| 1351 | return doAnimation(mDefaultSize); |
Yuli Huang | 2ce3c3b | 2012-02-23 22:26:12 +0800 | [diff] [blame] | 1352 | } |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1353 | |
| 1354 | // Starts an animation for a gap. |
| 1355 | public boolean doAnimation(int targetSize) { |
| 1356 | if (mCurrentGap == targetSize) return false; |
| 1357 | mAnimationKind = ANIM_KIND_SNAPBACK; |
| 1358 | mFromGap = mCurrentGap; |
| 1359 | mToGap = targetSize; |
| 1360 | mAnimationStartTime = AnimationTime.startTime(); |
| 1361 | mAnimationDuration = ANIM_TIME[mAnimationKind]; |
| 1362 | advanceAnimation(); |
| 1363 | return true; |
Yuli Huang | 2ce3c3b | 2012-02-23 22:26:12 +0800 | [diff] [blame] | 1364 | } |
Chih-Chung Chang | b7ec553 | 2012-04-03 12:21:16 +0800 | [diff] [blame^] | 1365 | |
| 1366 | @Override |
| 1367 | protected boolean interpolate(float progress) { |
| 1368 | if (progress >= 1) { |
| 1369 | mCurrentGap = mToGap; |
| 1370 | return true; |
| 1371 | } else { |
| 1372 | mCurrentGap = (int) (mFromGap + progress * (mToGap - mFromGap)); |
| 1373 | return (mCurrentGap == mToGap); |
| 1374 | } |
Yuli Huang | 2ce3c3b | 2012-02-23 22:26:12 +0800 | [diff] [blame] | 1375 | } |
Chih-Chung Chang | 532d93c | 2011-10-12 17:10:33 +0800 | [diff] [blame] | 1376 | } |
Chih-Chung Chang | ec41254 | 2011-09-26 17:34:06 +0800 | [diff] [blame] | 1377 | } |